golang http连接复用方法_Golang_

 package main import ( "fmt" "io/ioutil" "log" "net/http" "os" "strconv" "strings" "time" ) func connHandler(w http.ResponseWriter, r *http.Request) { // parse r.ParseForm() response_time := r.Header.Get("sleep-time") // <= NOTE if _, err := ioutil.ReadAll(r.Body); err != nil { http.Error(w, err.Error(), 500) return } defer r.Body.Close() // sleep for some time resp_time := 1 if response_time != "" { ms, _ := strconv.ParseFloat(response_time, 64) resp_time = (int)(ms * 1000) } time.Sleep(time.Duration(resp_time) * time.Millisecond) // parepare response status := 200 body := "" w.Header().Set("Content-Type", "text/plain") w.Header().Set("Content-Length", strconv.Itoa(len(body))) w.WriteHeader(status) w.Write([]byte(body)) } func main() { http.HandleFunc("/", connHandler) if err := http.ListenAndServe(":server_port", nil); err != nil { log.Fatal("ListenAndServe: ", err) } } 

 package main import ( "bytes" "fmt" "io" "io/ioutil" "log" "net/http" "time" ) var ( httpClient *http.Client ) const ( MaxIdleConnections int = 20 RequestTimeout int = 30 ) // init HTTPClient func init() { httpClient = createHTTPClient() } // createHTTPClient for connection re-use func createHTTPClient() *http.Client { client := &http.Client{ Transport: &http.Transport{ MaxIdle ConnsPerHost: MaxIdleConnections, }, Timeout: time.Duration(RequestTimeout) * time.Second, } return client } func conn_reuse_post(conn_reuse_times int) { var endPoint string = "http://server_ip:server_port/" data := []byte{} // fill data for i := 0; i < conn_reuse_times; i++ { // use global httpClient to send request resp, err := httpClient.Post(endPoint, "application/x-www-form-urlencoded", bytes.NewBuffer([]byte(data))) fmt.Println(resp) if err != nil { log.Println("err", err) return } io.Copy(ioutil.Discard, resp.Body) // <= NOTE resp.Body.Close() // <= NOTE } } func main() { conn_reuse_post(5) }